On 07/27/2012 04:39 PM, Bob Butcher wrote:
> I am no t sure about the best cutter, but have an almost free solution to the problem. I have been using a homemade cutter for PCBs recently, and it works fairly well. I have a number of solid carbide PCB drills that have broken, leaving a 1/8" diameter carbide drill rod about 1" long. I chucked these in my lathe and used an angle grinder with abrasive blade to grind a point on the end of the rod. I used an angle of about 45 degrees, but that is not critical. Then I carefully ground a flat on one side of the point, stopping as close to the exact center as possible. A diamond file was used to make the final flat as sharp as possible. The resulting cutter is capable of cutting the copper to about a .010-.015 width. The edges do have a bit of a burr, but this can be removed with an exacto knife or light sanding. An exacto knife may be required to remove any copper bits left in the cuts preventing shorted traces.
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> Bob
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Do you can post some photo of that?